Christian Sineath was a charming Rosabella, her lyric soprano lovely in ‘Somebody, Somewhere’ in the opening scene. She evinced tenderness in Rosabella’s duets with Tony, and anger and passion in her duet with Joe at the end of the first Act. Sineath credibly portrayed Rosabella’s naïveté, honesty and sincerity as she gradually warmed to Tony and ultimately falls in love with him.

— David Rice, Classical Source (Rosabella in Loesser's The Most Happy Fella)